What Are Cock Rings?
Cock rings are designed to help prolong and strengthen the male erection. Typically the cock ring is worn at the base of the penis however some come with a larger ring that stretches around the scrotum too. Beads or studs are often embedded to add to the stimulation.
Vibrating cock rings add to both male and female excitement, especially when they come into contact with the clitoris.
Keep in mind...
Be sure not to fall asleep while still wearing a cock ring. They can obviously affect blood flow to the penis if left on for extended periods of time.